Classical Physics

Force on an Electric Current Flowing Through the Inner Area of a Long Uniformly Cylindrical Shell Current

It is generally considered that an electric current does not experience any force when it flows through any area where the magnetic field is zero and any places having zero magnetic fields are identical in magnetism. However, if Newton’s third law works, an electric current must feel a pressure or expansibility when it flowing through the inside area of a uniformly cylindrical shell current, where the magnetic field is zero. Concerning the pressure or expansibility on an electric current, the zero magnetic field area inside a long uniformly cylindrical shell current is not identical in magnetism with the absolute zero magnetic field which is far away from any magnetic sources.

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